from The Century Dictionary and Cyclopedia

Etymologies

electro- + (exe)cute.

(American Heritage® Dictionary of the English Language, Fourth Edition)

electro- +‎ (exe)cute (Wiktionary)

Examples

The object was to deter evildoers by surrounding the penalty with scientific horror, [Footnote: Hence also the new lingual atrocity, the word "electrocute," derived from "execute" by decapitation and the addition of "electro"] and the idea had its origin in the accidents which formerly occurred much more frequently than now.

Hmmmm…. but I could stumble down the stairs, hit my head or trip on the couch leg. Oh no, I could electrocute myself, drown in the bathtub, die from fear of going out, talk on the phone during a lightening storm…

As many as several dozen people per day intentionally try to electrocute themselves along the rails, according to local media reports, because they believe it can cure all kinds of diseases, from diabetes to high-blood pressure to insomnia.

Mr Vilks, who was temporarily moved to a secret location, told the Associated Press this week that he had built himself his own defence system, including a “safe room” and a barbed-wire sculpture that could electrocute potential intruders.